Anyone know of some good gems or plugins to create dynamic / ajax
crud interfaces for Rails 3 projects? I know active scaffold was
popular before and it's been awhile since I have used it / any other
gems similar to this (I usually just write it myself).

I'am working on "How to Create a Blog from Scratch Using Ruby on
Rails" from http://sixrevisions.com. The tutorial was created for
Rails 2.x. I try to get It working on Rails 3.x. . When I run server I
and run localhost:3000 get some serious routing error: